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Mix stacking contexts into the positioned content list
Sometimes positioned content needs to be layered on top of stacking contexts. The layer synthesis code can do this, but the current design prevents it because stacking contexts are stored in a separate struct member. In order to preserve tree order, mix stacking contexts into the positioned content list, by adding a new StackingContextClass DisplayItem. Such items do not have a base DisplayItem. In some ways this simplifies the code, because we no longer have to have a separate code path in the StackingContextLayerCreator. Fixes #7779. Fixes #7983. Fixes #8122. Fixes #8310.
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13 changed files with 330 additions and 295 deletions
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@ -40,7 +40,6 @@ impl DisplayListOptimizer {
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display_list.positioned_content.iter());
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self.add_in_bounds_display_items(&mut result.outlines,
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display_list.outlines.iter());
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self.add_in_bounds_stacking_contexts(&mut result.children, display_list.children.iter());
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result
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}
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@ -50,39 +49,49 @@ impl DisplayListOptimizer {
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display_items: I)
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where I: Iterator<Item=&'a DisplayItem> {
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for display_item in display_items {
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if self.visible_rect.intersects(&display_item.base().bounds) &&
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display_item.base().clip.might_intersect_rect(&self.visible_rect) {
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result_list.push_back((*display_item).clone())
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if !self.should_include_display_item(display_item) {
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continue;
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}
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result_list.push_back((*display_item).clone())
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}
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}
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/// Adds child stacking contexts whose boundaries intersect the visible rect to `result_list`.
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fn add_in_bounds_stacking_contexts<'a, I>(&self,
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result_list: &mut LinkedList<Arc<StackingContext>>,
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stacking_contexts: I)
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where I: Iterator<Item=&'a Arc<StackingContext>> {
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for stacking_context in stacking_contexts {
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// Transform this stacking context to get it into the same space as
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// the parent stacking context.
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let origin_x = stacking_context.bounds.origin.x.to_f32_px();
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let origin_y = stacking_context.bounds.origin.y.to_f32_px();
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fn should_include_display_item(&self, item: &DisplayItem) -> bool {
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if let &DisplayItem::StackingContextClass(ref stacking_context) = item {
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return self.should_include_stacking_context(stacking_context);
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}
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let transform = Matrix4::identity().translate(origin_x,
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origin_y,
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0.0)
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.mul(&stacking_context.transform);
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let transform_2d = Matrix2D::new(transform.m11, transform.m12,
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transform.m21, transform.m22,
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transform.m41, transform.m42);
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if !self.visible_rect.intersects(&item.bounds()) {
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return false;
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}
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let overflow = geometry::au_rect_to_f32_rect(stacking_context.overflow);
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let overflow = transform_2d.transform_rect(&overflow);
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let overflow = geometry::f32_rect_to_au_rect(overflow);
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if self.visible_rect.intersects(&overflow) {
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result_list.push_back((*stacking_context).clone())
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if let Some(base_item) = item.base() {
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if !base_item.clip.might_intersect_rect(&self.visible_rect) {
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return false;
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}
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}
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true
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}
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fn should_include_stacking_context(&self, stacking_context: &Arc<StackingContext>) -> bool {
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// Transform this stacking context to get it into the same space as
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// the parent stacking context.
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let origin_x = stacking_context.bounds.origin.x.to_f32_px();
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let origin_y = stacking_context.bounds.origin.y.to_f32_px();
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let transform = Matrix4::identity().translate(origin_x,
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origin_y,
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0.0)
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.mul(&stacking_context.transform);
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let transform_2d = Matrix2D::new(transform.m11, transform.m12,
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transform.m21, transform.m22,
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transform.m41, transform.m42);
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let overflow = geometry::au_rect_to_f32_rect(stacking_context.overflow);
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let overflow = transform_2d.transform_rect(&overflow);
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let overflow = geometry::f32_rect_to_au_rect(overflow);
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self.visible_rect.intersects(&overflow)
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}
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}
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